一個使用QtXmlPatterns模組讀取xml 的例子

 #include <QApplication><br />#include <QFile><br />#include <QBuffer><br />#include <QIODevice><br />#include <QtXmlPatterns><br />#include <QXmlFormatter><br />#include <QLabel></p><p>int main(int argc, char *argv[])<br />{<br /> QApplication app(argc, argv);</p><p> QFile sourceDocument;<br /> sourceDocument.setFileName("cookbook.xml");<br /> sourceDocument.open(QIODevice::ReadOnly);<br /> QXmlQuery query;<br /> query.bindVariable("inputDocument", &sourceDocument);<br /> //之所以要將綁定 inputDocument 變數，估計是為了把需要查詢的 xml 檔案設定為可讀模式，然後才能 setQuery 查詢。<br /> query.setQuery("(: Select all recipes. :)/ndeclare variable $inputDocument external; /ndoc($inputDocument)/cookbook/recipe/<p>{string(title)}</p>/n");</p><p> QByteArray outArray;<br /> QBuffer buffer(&outArray);<br /> buffer.open(QIODevice::ReadWrite);<br /> QXmlFormatter formatter(query, &buffer);<br /> query.evaluateTo(&formatter);</p><p> if (query.evaluateTo(&formatter))<br /> {<br /> buffer.close();<br /> QLabel *label = new QLabel(QString::fromUtf8(outArray.constData()));<br /> label->show();<br /> }</p><p> sourceDocument.close();<br /> return app.exec();<br />}